TM 9-2320-260-20
THIS TASK COVERS:
b. Adjustment
a. Testing
INITIAL SETUP
EQUIPMENT CONDITION
APPLICABLE MODELS
q Parking brake set (TM 9-2320-260-10).
M816
q Boom fully retracted (TM 9-2320-260-10).
REFERENCES (TM)
TM 9-2320-260-10
TM 9-2320-260-20P
1. Remove plug (6) from elbow (7).
2. Install hydraulic pressure gage fitting (5) on elbow (7).
3. Start engine (TM 9-2320-260-10).
4. Lower cable hook (1) enough to provide travel for pressure testing hydraulic system.
5. Hold boom crowd control lever (4) in retracted position and hoist control lever (3) in up position.
Record reading on hydraulic pressure gage (2).
6. Reading on hydraulic pressure gage (2) should be 1200 psi (8274 kpa). If reading is not 1200 psi
(8274 kpa), adjustment is required.
CAUTION
Never adjust relief valve without using pressure gage. Equipment
failure will occur.
1. Remove capnut (11) from relief valve (8) and loosen nut (9).
2. Turn setscrew (10) clockwise to increase hydraulic pressure, or counterclockwise to decrease
hydraulic pressure.
3. Hold setscrew (10) and tighten nut (9) on relief valve (8).
4. Install capnut (11) on relief valve (8).
5. Retest hydraulic pressure system.
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